5. Replacement of damaged signal cables and equipment; and replacement of tunnel lighting cables and fixtures.

The key elements of work are described as follows:
1. Duct banks: Demolition and reconstruction of the inner and outer duct banks from 1st Avenue Station in Manhattan to Bedford Avenue Station in Brooklyn for approximately 30,330 linear feet. Demolition of upper wall ducts (inner wall) between Avenue D shaft in Manhattan and North 7th Shaft in Brooklyn for a total of 6,872 feet.

2. Power System: Removal and replacement of various power cables throughout the tunnel, including negative feeder cables, positive cables, battery cables, control cables, and Tunnel shell protection cables.

3. Communication Systems: Removal and replacement of various communications cables throughout the Tunnel such as 36-strand Fiber Optic Cables (about 50,000 LF), various sizes of Copper Cables (about total: 41,350 LF) and Radio/Antenna Cables (15/8 Radiating Cable and 7/8 Non-Radiating Cable  38,000 LF) on the walls and/or in the duct banks of the Tunnel. Work also includes removal and installation of 40 Emergency Alarm/ Emergency Telephone units to be provided by NYCT and removal and replacement of FDNY sound powered telephone cables and jacks.

4. Circuit Breaker House (CBH) #61 and #62: Removal of existing Circuit Breaker House #61, currently located mid-river in the Canarsie Tunnel, and construction of new CBH #61 at the location adjacent to Emergency Exit 171 below East 14th Street near Ave B in Manhattan. Removal of existing CBH#62 and construction of new CBH#62 at the location adjacent to north end platform of Bedford Avenue Station. For these two CBHS, remove and install positive, battery and control cables; copper buses; control terminal box, RAIC; relay panels, battery switch box, lighting fixtures, heaters, switches and cables; install flood doors.

5. Track: Replace about 5,000 LF of rails between Avenue D and North 7th Vent Shaft (2500 LF on each Track Q1 and Q2. 6. Pump Room # 1035: Complete reconstruction of pump room #1035, including installation of new discharge line between Avenue D shaft in Manhattan and North 7th Shaft in Brooklyn for a total of 6,872 feet

Duration of Contract 40 MonthsProbably weekend shutdown due to date of the contract, 3+ years.

Yeah. They turn M trains there on weekends when the L is down, they turn Q trains there at night when the BMT is closed for Fast Track and they turned B and Q trains there in 1998 when the line between there and Lexington Avenue was closed for some reason.

...and they turned B, F, KK, JFK, and various other trains there when it was a terminal station prior to 1989.

I would this time myself extend the (M) and have it go to 145th/St. Nicholas (via the (B) after 47th-50th) since the MTA to use that as an experiment to see if on a more permanent basis having a 6th Avenue-CPW local is worth it.

For this type of a shutdown, I would seriously consider having the (M) go to 145th Street-8th Avenue OR (once the SAS opens) 96th/2nd on weekends UNLESS the (M) can run its regular weekday route on weekends while Queens Boulevard work goes on.

57th/6th is not ideal for a long-term terminal (even on weekends) due to the (F) using that as a through station.

There was a time when the NYCTA limited the number and location of GOs that could be operated at any one time, but unfortunately that is no longer the case so its hard to predict what would be the most appropriate routing for a long term extension of the M when the N 7 St tube goes out.